Is it possible that Bill Gates is NOT the richest person in the world?

I heard that if somebody is rich but does not want their name published on Forbes - Forbes will simply "pretend" that they don't exist so there could be somebody who has more money then Bill Gates that does not want his / her name published in the news.

The Rothschild family fortune is worth 700 trillion dollars and they only have one living heir to the entire fortune who is worth $70 000 000 on his own even without inheriting the family fortune. He is married to Nicky Hilton, Paris Hilton's sister.

who knows, but think of how many world problems the rothschild fortune could solve. im not against people being rich per se, but just to put it into perspective, if the rothschild heir gave every single person in the world an equal amount of money, it would be roughly $100,000.